If you don't want end of support notifications on Windows 7, block KB4493132

[noneof_theabove]

8. Time to let it die

unless you are running "must have" and not upgradeable programs.

I did an in place upgrade to a 2009 HP with Win7 Pro to Win10 1809 [1903 ugh May not out]
and it went absolutely smooth.

You MUST HAVE the original/active license number, that yellow tag with xxxxx-xxxxx-xxxxx-xxxxx-xxxxx on it
or use a license recovery program. Several places recommend Nirsoft but I have no experience with it and there are others.

After the upgrade go to system and see if it shows a registered license [genuine] and if not there is a
"enter another license" or some such and click it and enter you original Win7 License [above].

That is it.

I've been in PC repair for years and put of purchasing an SSD and Win10 for dual boot because I still need Win7 but for average people the upgrade is still there and FREE
NOTE: MS can cancel the free upgrade at a any time.